Re: [PATCH net] net: phy: Warn about incorrect mdio_bus_phy_resume() state

[Jakub Kicinski]

On Mon,  1 Aug 2022 16:34:03 -0700 Florian Fainelli wrote:
> Calling mdio_bus_phy_resume() with neither the PHY state machine set to
> PHY_HALTED nor phydev->mac_managed_pm set to true is a good indication
> that we can produce a race condition looking like this:
> 
> CPU0						CPU1
> bcmgenet_resume
>  -> phy_resume
>    -> phy_init_hw
>  -> phy_start
>    -> phy_resume  
>                                                 phy_start_aneg()
> mdio_bus_phy_resume
>  -> phy_resume
>     -> phy_write(..., BMCR_RESET)
>      -> usleep()                                  -> phy_read()  
> 
> with the phy_resume() function triggering a PHY behavior that might have
> to be worked around with (see bf8bfc4336f7 ("net: phy: broadcom: Fix
> brcm_fet_config_init()") for instance) that ultimately leads to an error
> reading from the PHY.

Hi Florian! There were some follow ups on this one, were all the known
reports covered at this point or there are still platforms to tweak?